Two-party telephone system.



H. P. JOBOKEL.

TWO PARTY TELEPHONE SYSTEM.

APPLICATION FILED FEB. 15, 1912.

1, 1 1 1 ,024, I Patented Sept. 22, 1914.

THE NORRIS PETERS CO. PHOTO-L!THO.. WASHINGTON. D c.

UNITED STATES PATENT OFFICE,

HENRY F. JOECKEL, OF CAMP POINT, ILLINOIS.

TWO-PARTY TELEPHONE SYSTEM.

To all whom it may concern Be it known that I, HENRY F. JoEo EL, a citizen of the United States, residing at Camp Point, in the county of Adams and State of Illinois, have invented new and useful Improvements in Two-Party Telephone Systems, of which the following is a specification, and which is illustrated in the accompanying drawing.

The invention relates to two-party selec tive signaling systems in which two line wires are used with annunciators of substations connected to ground from each line wire.

The object of this system is to provide means by which two parties of a telephone line may selectively signal one another or the central station and in which the central station can selectively signal the parties.

These objects are obtained in the mechanism and system of wiring, as hereinafter described and shown in the accompanying drawing. a

The drawing represents a central station at 20, and substations at 21, and 22, of a two party selective signaling telephone line. The line wires are shown at L and L and at 1 1- the annunciator of the central station which is bridged from L to L at the line jack 18, by contacts 0, and cl, at the line jack springs 64, and Z), respectively. The annunciator 14, is cut out as usual whenever a switching plug is inserted into the line ack. At L and L*, a portion of the leads of a cord set terminating in a switching plug is shown. The magneto 1, is connected to ground on one side and is connected on the other side to a switching lever P by which the magneto may be connected to L or L*, which register with L and L respectively, whenever the switching plug is inserted into the line ack.

In the drawing like numbers represent like parts.

The telephones of substations 21 and 22 each have a magneto '1, an annunciator 2,

' transmitter 3, receiver 4, induction coil 5,

local battery 6, switch hook 7, condenser 8, and a switch F, and station 21 has a switch E, these switches F, and E, may be of the ordinary push-button type.

The telephone of substation 21 has binding posts A, B and C, and is connected to L by binding post O, to L by binding post A, and to the ground by binding post B.

Specification of Letters Patent.

Application filed February 15, 1912.

The secondary talking circuit from L to L Patented Sept. 22, 1914 Serial No. 677,668.

is by binding post A, wire f, switch hook 7 wire 7", induction coil 5, wire 7, condenser 8, receiver 41, wire f, and binding post C; the circuit is however normally interrupted at the switch hook. The normal circuit of the annunciator is from L to ground, by binding post A, wire f, contact is, switcharm F, wire it, annunciator 2, wire h, switcharm E, contact and wire f, and binding post B. The magneto 1, has two circuits which are used in this system one is from L to L by binding 0st G, wire f, contact 0, switcharm E, wire it, automatic cut out 8, magneto 1, switcharm F, contact is, wire f, and binding post A, the other circuit is from L to ground,by binding post C, wire f, contact t, switcharm F, magneto 1, automatic cut out 8, wire it, switcharm E, contact and wire f, and binding post B. This telephone set is wired in accordance with the telephone system of Patent No. 1,007,575.

The telephone of substation 22 has binding posts A, B, and C, and is connected to L by binding post C, to L by binding post A, and to the ground by binding post B. The secondary talking circuit from L to L is by binding post C, wire f, receiver 4, condenser 8, wire 7, induction coil 5, wire f switch hook 7, wire f, and binding post A; the circuit is however normally interrupted at the switch hook. The normal circuit of the annunciator is from L to ground, by binding post C, wire 7, contact is, switcharm F, wire it, automatic cut out 9, wire it, annunciator 2, wire it, wire 7, and binding post B. The magneto 1, has two circuits one is from L to L by binding post A, wire f, wire 1", magneto 1, automatic cut out 8, wire it, switcharm F, contact is, wire 7, and binding post 0, the other circuit is from L to ground by binding post A, wire f, wire r, magneto 1, automatic cut out 8, wire it, switcharm F, contact t, wire 7, and binding post B. In this telephone system the annunciator at a station must first be disconnected from its normal circuit before that station can selectively signal another station this may be accomplished several ways at a substation therefore I have shown two different styles of wiring, either or both styles may be used upon a line.

I recommend the bells and magnetos of the usual bridging telephone system to be used in this telephone system, it however is to e. understood that other styles of a nunciators and magnetos may be used in this system, the annunciators must however be adapted to operate with the current of the magneto of the station calling or the magneto or generator must produce a current suitable to operate the annunciator of the station called.

The construction and operations of the parts used in the combination of this twoparty telephone system are so well known that no-further explanation will be needed.

one from one side of the metallic circuit the other from the other side of the metallic circuit, a magneto in normally open circuit at each substation and means at each substation to disconnect the annunciator from its the magneto selectively in circuit with the annunciator of the other substation or in circuit with the annunciator of the central station, and means at the central station to bridges being however normally interrupted,

at the switch hook, an annunciator at each of said substations normally connected to ground one from one side of the metallic circuit the other from the other side of the metallic circuit, a magneto in normally open circuit at each substation and means at each substation to cut the annunciator out of cir-,

cuit at the substation and to place the magneto at the same selectively in circuit with the annunciator of the other substation or in circuit with the annunciator of the central station, and means at the central station to selectively signal either substation upon their respective sides, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. normal c1rcu1t and at the same tune to place i "HENRY F. JOECKEL.

Vitnesses:

JOHN R. VVALLACE, G. C. EMBER.

Copies 01} this patent maybe obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

